North Korea sent mixed signals Saturday on nuclear disarmament, saying it was preparing to shut down its main plutonium program but that no action would be taken unless frozen funds were released from a Macau bank. Arriving from Pyongyang for follow-up meetings on a disarmament agreement reached last month, North Korean nuclear envoy Kim Kye Gwan told reporters that North Korea "will not stop its nuclear activity" until all of the US$25 million (â‚¬19 million) in Banco Delta Asia was returned. But later in the day at the talks, another North Korean diplomat, Kim Song Gi, said the regime has "begun preparations to shut down its Yongbyon nuclear facility" as part of a landmark Feb. 13 pact, South Korean nuclear envoy Chun Yung-woo told reporters afterward. In addition, the diplomat promised that North Korea will submit a list of its nuclear programs and disable its nuclear facility "as soon as the right conditions are created," Chun said, without explaining what the conditions were. Whether shutdown preparations were under way was not independently confirmed by Chun. US Assistant Secretary of States Christopher Hill, the top American envoy, said late Saturday that North Korea was still "fulfilling their obligations." The fate of the frozen funds, the result of a blacklisting by US authorities, has become a central issue in the disarmament talks. Washington promised to resolve the bank issue as an inducement to North Korea to disarm, but its solution - an order this past week to US banks to sever ties with the Macau bank - has been criticized by China and now North Korea's envoy. Under the Feb. 13 agreement, which involves the two Koreas, the US, China, Japan and Russia, North Korea has 60 days to shutter the Yongbyon reactor and a plutonium processing plant which have produced material for a nuclear weapons program. UN monitors are supposed to be allowed in North Korea to verify the shutdown, and once confirmed North Korea is to receive energy and economic assistance. The US promise to resolve the Banco Delta Asia funds, which US authorities suspect may be tainted by counterfeiting or money laundering, was part of a side agreement. "We are on schedule for this first phase," Hill told reporters after daylong meetings with delegates from the other five countries. Also Saturday, a senior US Treasury Department official traveled to Macau to discuss the Banco Delta Asia issue. The government of Macau - a semiautonomous Chinese territory - has the authority to decide whether to release any of the funds, which have been frozen since 2005. "I think it is important to emphasize this was a Macanese action to freeze the funds, and it would be a Macanese process to determine" whether to release them, US Deputy Assistant Treasury Secretary Daniel Glaser told reporters. He described his talks with Macau officials as productive. The Treasury Department is expected to help Macau's regulators identify accounts connected to North Korea that are not tainted by links to alleged nuclear proliferation or counterfeiting, smuggling and other crimes. That is expected to prompt bank regulators to unfreeze between US$8 million (â‚¬6.1 million) and US$12 million (â‚¬9.1 million), one US official has said on condition of anonymity in accordance with policy. Hill said he expected "the money to be moving very quickly in terms of completing this whole case and finally resolving it," but gave no details. As part of the disarmament meetings in Beijing, Hill said he would push North Korea to disclose all its nuclear programs, including an alleged uranium enrichment program. "It's very important to resolve the uranium enrichment matter," he said. "We need to know what this program was, we need to account for what their equipment was. ... We need clarity on what they have been doing with this equipment." US allegations that North Korea has a secret uranium enrichment program brought on a nuclear crisis in 2002 that prompted the country to expel UN inspectors and eventually led to North Korea exploding its first nuclear device in October. North Korea has never publicly acknowledged having a uranium program, although Kim Kye Gwan indicated the North was willing to discuss the issue with Washington.